/Engine/Plugins/MovieScene/MovieRenderPipeline/Source/MovieRenderPipelineCore/Public/MovieRenderPipelineDataTypes.h
What is the current state of a shot? States are processed in order from first to last but not all states are required, ie: WarmUp and MotionBlur can be disabled and the shot will never pass through this state.
enum EMovieRenderShotState { Uninitialized = 0, WarmingUp = 1, MotionBlur = 2, Rendering = 3, Finished = 4, }